package com.dinglit.exception;

import java.util.Set;

import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.http.HttpStatus;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.ResponseStatus;

import com.dinglit.until.AjaxResult;

/**
 * 169876809
 * 
 * @author qianzhang
 * 
 * @description:全局异常处理
 * 
 * @ ControllerAdvice是一个@ Component， 
 *   用于定义@ ExceptionHandler的，@InitBinder和@ModelAttribute方法，
 *   适用于所有使用@ RequestMapping方法，并处理所有@ RequestMapping标注方法出现异常的统一处理。
 */
@ControllerAdvice
@ResponseBody
public class CommonExceptionAdvice {

	private static Logger logger = LoggerFactory
			.getLogger(CommonExceptionAdvice.class);

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(MissingServletRequestParameterException.class)
	public AjaxResult handleMissingServletRequestParameterException(
			MissingServletRequestParameterException e) {
		logger.error("缺少请求参数", e);
		return new AjaxResult().failure("required_parameter_is_not_present");
	}

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(HttpMessageNotReadableException.class)
	public AjaxResult handleHttpMessageNotReadableException(
			HttpMessageNotReadableException e) {
		logger.error("参数解析失败", e);
		return new AjaxResult().failure("could_not_read_json");
	}

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(MethodArgumentNotValidException.class)
	public AjaxResult handleMethodArgumentNotValidException(
			MethodArgumentNotValidException e) {
		logger.error("参数验证失败", e);
		BindingResult result = e.getBindingResult();
		FieldError error = result.getFieldError();
		String field = error.getField();
		String code = error.getDefaultMessage();
		String message = String.format("%s:%s", field, code);
		return new AjaxResult().failure(message);
	}

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(BindException.class)
	public AjaxResult handleBindException(BindException e) {
		logger.error("参数绑定失败", e);
		BindingResult result = e.getBindingResult();
		FieldError error = result.getFieldError();
		String field = error.getField();
		String code = error.getDefaultMessage();
		String message = String.format("%s:%s", field, code);
		return new AjaxResult().failure(message);
	}

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(ConstraintViolationException.class)
	public AjaxResult handleServiceException(ConstraintViolationException e) {
		logger.error("参数验证失败", e);
		Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
		ConstraintViolation<?> violation = violations.iterator().next();
		String message = violation.getMessage();
		return new AjaxResult().failure("parameter:" + message);
	}

	/**
	 * 400 - Bad Request
	 */
	@ResponseStatus(HttpStatus.BAD_REQUEST)
	@ExceptionHandler(ValidationException.class)
	public AjaxResult handleValidationException(ValidationException e) {
		logger.error("参数验证失败", e);
		return new AjaxResult().failure("validation_exception");
	}

	/**
	 * 405 - Method Not Allowed
	 */
	@ResponseStatus(HttpStatus.METHOD_NOT_ALLOWED)
	@ExceptionHandler(HttpRequestMethodNotSupportedException.class)
	public AjaxResult handleHttpRequestMethodNotSupportedException(
			HttpRequestMethodNotSupportedException e) {
		logger.error("不支持当前请求方法", e);
		return new AjaxResult().failure("request_method_not_supported");
	}

	/**
	 * 415 - Unsupported Media Type
	 */
	@ResponseStatus(HttpStatus.UNSUPPORTED_MEDIA_TYPE)
	@ExceptionHandler(HttpMediaTypeNotSupportedException.class)
	public AjaxResult handleHttpMediaTypeNotSupportedException(Exception e) {
		logger.error("不支持当前媒体类型", e);
		return new AjaxResult().failure("content_type_not_supported");
	}

	/**
	 * 500 - Internal Server Error
	 */
	@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
	@ExceptionHandler(ServiceException.class)
	public AjaxResult handleServiceException(ServiceException e) {
		logger.error("业务逻辑异常", e);
		return new AjaxResult().failure("业务逻辑异常：" + e.getMessage());
	}

	/**
	 * 500 - Internal Server Error
	 */
	@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
	@ExceptionHandler(Exception.class)
	public AjaxResult handleException(Exception e) {
		logger.error("通用异常", e);
		return new AjaxResult().failure("通用异常：" + e.getMessage());
	}

	/**
	 * 操作数据库出现异常:名称重复，外键关联
	 */
	@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
	@ExceptionHandler(DataIntegrityViolationException.class)
	public AjaxResult handleException(DataIntegrityViolationException e) {
		logger.error("操作数据库出现异常:", e);
		return new AjaxResult().failure("操作数据库出现异常：字段重复、有外键关联等");
	}
}